Improved validation

Author: rmraya

TODO.md

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+# TypesXML TODO List
+
+This document tracks outstanding tasks, missing features, and improvements needed across the TypesXML codebase.
+
+## Core Parser Features
+
+### DTD Validation Enhancements
+
+#### Content Model Validation
+
+- **Location**: DTD grammar processing
+- **Description**: Enhance element content model validation
+- **Details**:
+  - Improve sequence and choice validation
+  - Better cardinality checking (?, *, +)
+  - Mixed content model validation
+- **Priority**: Medium
+
+### XML Schema Support
+
+#### Complete XML Schema Implementation
+
+- **Location**: `ts/schema/` directory
+- **Description**: XML Schema validation is currently in initial implementation stage
+- **Details**:
+  - Complete complex type validation
+  - Simple type restriction validation
+  - Namespace-aware validation
+  - Schema imports and includes
+  - Identity constraints (key, keyref, unique)
+- **Priority**: High
+- **Status**: Framework ready, needs full implementation
+
+#### Complex Type Extension and Derivation Support
+
+- **Location**: `ts/schema/` directory, complex type handling
+- **Description**: Handle complex type extensions and restrictions properly
+- **Details**:
+  - Implement complex type extension validation (e.g., USAddress extending AddressType)
+  - Support for `<complexContent><extension>` patterns
+  - Proper inheritance chain validation for extended sequences
+  - Handle type substitution with `xsi:type` attributes
+- **Priority**: Medium
+- **Status**: Framework ready, needs specific implementation
+
+#### AnyParticle Namespace Constraint Enhancement
+
+- **Location**: `ts/schema/AnyParticle.ts`
+- **Description**: Improve xs:any namespace constraint validation
+- **Details**:
+  - Fix namespace constraint validation for `##other`, `##any`, `##targetNamespace`
+  - Proper wildcard namespace matching in sequences
+  - Better error reporting for namespace constraint violations
+- **Priority**: Medium
+
+#### JSON Conversion Support
+
+- **Location**: New module
+- **Description**: Add bidirectional XML-JSON conversion capabilities
+- **Details**:
+  - **XML to JSON conversion**:
+    - Convert XML documents to JSON format
+    - Configurable conversion strategies (attributes as properties, arrays for repeated elements)
+    - Preserve namespace information in JSON output
+    - Handle mixed content and CDATA sections
+  - **JSON to XML conversion**:
+    - Convert JSON objects to well-formed XML
+    - Support for custom element naming conventions
+    - Configurable attribute vs element mapping
+    - Root element wrapping options
+  - **Configuration options**:
+    - Custom conversion rules and mappings
+    - Schema-aware conversion (when DTD/XSD available)
+    - Formatting and indentation preferences
+    - Namespace handling strategies
+- **Priority**: Medium
+- **Status**: To be implemented
+
+#### RelaxNG Grammar Support
+
+- **Location**: Grammar framework
+- **Description**: Add RelaxNG schema validation support
+- **Details**:
+  - Create RelaxNGGrammar class implementing Grammar interface
+  - Parse RelaxNG schemas (.rng files)
+  - Implement RelaxNG validation rules
+- **Priority**: Low
+- **Status**: Framework ready, future implementation
+
+#### XML Model Processing (DOMBuilder.ts:369)
+
+- **Location**: `ts/DOMBuilder.ts`, line 369
+- **Description**: Implement xml-model processing instruction support
+- **Details**:
+  - Parse xml-model processing instructions
+  - Support different schema types (DTD, XSD, RelaxNG)
+  - Automatic schema association
+- **Priority**: Low
+
+## Parser Architecture Enhancements
+
+### Entity Content Processing
+
+- **Location**: `ts/SAXParser.ts`, handleEntityContent method
+- **Description**: The current entity content handling is simplified
+- **Details**:
+  - Improve markup content detection and parsing
+  - Better handling of complex entity content
+  - More sophisticated content type analysis
+- **Priority**: Low
+- **Impact**: Edge case handling
+
+### Processing Instruction Validation
+
+- **Location**: `ts/SAXParser.ts`, parseProcessingInstruction method
+- **Description**: Enhanced PI validation and processing
+- **Details**:
+  - Validate PI target names more thoroughly
+  - Better error messages for malformed PIs
+  - PI-specific content validation
+- **Priority**: Low
+
+### Comment Validation Enhancements
+
+- **Location**: `ts/SAXParser.ts`, parseComment method
+- **Description**: Improve comment validation and error reporting
+- **Details**:
+  - Better handling of "--" sequences in comments
+  - Configurable validation strictness
+  - Performance optimization for large comments
+- **Priority**: Low
+
+## Grammar Framework Improvements
+
+### Cross-Schema Group Resolution
+
+- **Location**: `ts/grammar/CompositeGrammar.ts`, resolveAllGroupReferences method
+- **Description**: Post-loading resolution of cross-schema group references
+- **Details**:
+  - Implement unresolved group reference tracking
+  - Add resolution phase after all schemas are loaded
+  - Handle circular group dependencies
+- **Priority**: Medium
+
+### Advanced Namespace Resolution
+
+- **Location**: `ts/grammar/CompositeGrammar.ts`, findElementNameForLookup method
+- **Description**: Enhance context-aware element lookup
+- **Details**:
+  - Implement local element resolution with parent context
+  - Better handling of elementFormDefault settings
+  - Improved qualified name resolution
+- **Priority**: Medium
+
+### Simple Type Validation Enhancement
+
+- **Location**: `ts/grammar/CompositeGrammar.ts`, validateSimpleType method
+- **Description**: Expand simple type validation capabilities
+- **Details**:
+  - Add comprehensive built-in type validation
+  - Implement restriction facets (pattern, length, etc.)
+  - Union and list type validation
+- **Priority**: Medium
+
+## Testing and Quality Assurance
+
+### W3C XML Schema Test Suite Integration
+
+- **Location**: Test framework
+- **Description**: Add comprehensive XML Schema test suite
+- **Details**:
+  - Integrate W3C XML Schema test cases
+  - Automated regression testing
+  - Performance benchmarking
+- **Priority**: Medium
+
+### Error Reporting Enhancement
+
+- **Location**: Throughout codebase
+- **Description**: Improve error messages and debugging information
+- **Details**:
+  - Add line/column information to more error types
+  - Context-aware error messages
+  - Better validation error aggregation
+- **Priority**: Medium
+
+### Performance Optimization
+
+- **Location**: Core parsing logic
+- **Description**: Optimize parsing performance for large documents
+- **Details**:
+  - Buffer management optimization
+  - Streaming parser improvements
+  - Memory usage optimization
+- **Priority**: Low
+
+## Documentation and Developer Experience
+
+### API Documentation Completion
+
+- **Location**: Documentation files
+- **Description**: Complete API documentation for all public interfaces
+- **Details**:
+  - Grammar interface documentation
+  - Schema validation examples
+  - Advanced configuration guides
+- **Priority**: Medium
+
+### TypeScript Type Definitions
+
+- **Location**: Type definition files
+- **Description**: Enhance TypeScript type definitions
+- **Details**:
+  - More specific return types
+  - Better generic type constraints
+  - Documentation comments in types
+- **Priority**: Low
+
+### Example Applications
+
+- **Location**: Examples directory (to be created)
+- **Description**: Create comprehensive example applications
+- **Details**:
+  - DTD validation examples
+  - XML Schema validation examples
+  - Catalog resolution examples
+  - Custom Grammar implementation example
+- **Priority**: Low
+
+## Code Quality and Maintenance
+
+### URI Validation Enhancement
+
+- **Location**: `ts/schema/BuiltinTypes.ts`
+- **Description**: The URI validation is currently very basic
+- **Details**:
+  - Implement comprehensive URI validation
+  - Support for different URI schemes
+  - Better error messages for invalid URIs
+- **Priority**: Low
+
+## Future Enhancements
+
+### XPath Expression Support
+
+- **Location**: New module
+- **Description**: Add XPath query support for DOM navigation
+- **Details**:
+  - Basic XPath 1.0 implementation
+  - Integration with XMLDocument and XMLElement
+  - Query optimization
+- **Priority**: Low
+
+### XSLT Transformation Support
+
+- **Location**: New module
+- **Description**: Add XSLT transformation capabilities
+- **Details**:
+  - XSLT 1.0 processor implementation
+  - Integration with existing XML parsing
+  - Template matching and transformation
+- **Priority**: Very Low
+
+### XML Signature Support
+
+- **Location**: New module
+- **Description**: Add XML Digital Signature support
+- **Details**:
+  - XML-DSIG implementation
+  - Canonicalization support
+  - Certificate validation
+- **Priority**: Very Low
+
+---
+
+## Priority Legend
+
+- **High**: Critical for core functionality, blocks major features
+- **Medium**: Important for completeness, affects user experience
+- **Low**: Nice to have, improves edge case handling
+- **Very Low**: Future enhancements, not immediately needed
+
+## Status Legend
+
+- **Framework ready**: Architecture in place, needs implementation
+- **Future implementation**: Planned for future releases
+- **In progress**: Currently being worked on
+
+---
+
+*Last updated: January 2025*
+*TypesXML Version: 2.0.0*